Combination upper and lower receiver for a firearm



FIG. 1 is an upper perspective view of an upper receiver and a lower receiver;

FIG. 2 is an upper perspective view thereof;

FIG. 3 is a lower perspective view thereof;

FIG. 4 is a lower perspective view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a side view thereof; and,

FIG. 7 is a side view thereof.

The broken lines in the drawings depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a combination upper and lower receiver for a firearm, as shown and described. 